blindtrainer.com

Blindtrainer's data tools are built around a single identifier: your Your ID. You enter an ID, click Update my ID, and your training stats — streak, total cases trained, time spent training, and most cases trained in one day — are tied to that ID. Sync Data pulls that record back down, while Import and Export move the same data in and out of the site manually. If you train on more than one device or browser, setting the same ID on each one is what keeps your numbers consistent.

What each control does

The stats these controls cover are the ones shown on the page: Streak, Total cases trained, Time spent training, and Most cases trained in 1 day.

Setting up an ID so sync works

1. Type an identifier into the Your ID field. It can be anything you'll remember — the site doesn't require a specific format.
2. Click Update my ID. This binds the current browser to that ID.
3. Repeat on every other device or browser you train on, using the same ID.
4. Click Sync Data on each device to pull the latest numbers.

The key point: sync follows the ID, not the device. If two devices use different IDs, they will never see each other's stats.

Backing up and moving your data

Because the page exposes both Export and Import, the safe routine is:

• Before any destructive action (see the reset options below), click Export and save the file somewhere you control.
• To restore or migrate, open Blindtrainer on the target device, set the correct ID, then use Import to load the exported data.
• After importing, click Sync Data so the displayed stats match what you just loaded.

This is the practical answer to "how do I move my training history to a new computer" — export on the old one, import on the new one, and keep the same ID on both.

Resets: know what you're clearing

The page includes three separate reset controls, and they are not the same thing:

• Reset — clears the current training state.
• Slow Cases — clears the record of cases you've been slow on (the ones flagged for extra drilling).
• Hard Reset — the broad wipe.

Export first if any of those numbers matter to you. A Hard Reset is the one most likely to cost you history you can't reconstruct.

Common snags

• Stats look wrong after switching devices. You probably typed a different ID. Re-enter the original ID and click Update my ID, then Sync Data.
• You imported but nothing changed. Confirm the ID is set correctly before importing, then sync.
• You reset without exporting. There's no described undo for a Hard Reset — the export/import pair is the backup mechanism, so use it proactively.

What the page does not specify

The site text doesn't state where the data is stored, how long it's retained, whether an ID is private or guessable, or whether sync happens automatically. Treat Sync Data as the explicit refresh action and Export as your own copy, rather than assuming background syncing. The donation section notes that support keeps the site "100% free" and funds maintenance and updates, but it says nothing about data retention or account recovery — so don't rely on the site as your only backup.

Blindtrainer is a free, browser-based training tool for Rubik's Cube blindfolded solving. It is built around drilling commutators and algorithms — primarily 3-style — for corners, edges, wings, centers, and parity cases. You pick a case set, work through cases one at a time, and the site tracks your streak, total cases trained, time spent, and your best single-day volume. If you already solve blindfolded and want structured repetition instead of scrolling through a spreadsheet of algs, this is the tool's purpose.

What you can practice

The trainer organizes practice into case sets rather than one undifferentiated pool. From the site:

The mix covers the standard 3-style territory plus the "floating" buffer variants that more advanced solvers use to avoid fixed-buffer bottlenecks. If you are still on a single fixed buffer, the core corner and edge sets are the natural starting point; the floating and center sets matter once you are pushing into big-cube blindfolded or optimizing your buffer choices.

How a practice session works

1. Choose a case set (for example, Corners or Wings).
2. The trainer presents cases for you to solve.
3. Solve each one using your commutator or algorithm.
4. The site records the attempt and moves you to the next case.

Alongside the case display, the interface keeps a running Streak, Total cases trained, Time spent training, and Most cases trained in 1 day. Those four numbers are your feedback loop — they tell you whether you are actually putting in volume or just opening the page.

Customization and data

• Accent Color — visual preference only.
• Speffz / Custom — choose the standard Speffz lettering scheme or define your own. The custom option exposes the full sticker list (UBL, UBR, UFR, UFL, LUB, LUF, LDF, LDB, FUL, FUR, FDR, FDL, RUF, RUB, RDB, RFD, BUR, BUL, BDL, BDR, DFL, DFR, DBR, DBL, UB, UR, UF, UL, LU, LF, LD, LB, FU, FR, FD, FL, RU, RB, RD, RF, BU, BL, BD, BR, DF, DR, DB, DL), so you can remap letters to match however you actually read the cube.
• Slow Cases — isolates the cases you are slowest on, so you can drill weaknesses instead of re-solving what you already know.
• Hard Reset — wipes progress. Use it deliberately; there is no undo described.
• Sync Data / Import / Export / Your ID — progress can be tied to an ID and moved between sessions or devices via import and export. If you train on more than one machine, set up the ID before you accumulate a long streak.

Cost and how it stays online

The site states it is 100% free and asks for donations to cover maintenance costs and fund regular updates. Donation routes listed are PayPal ([email protected]) and a bank account (AT16 3306 5000 0197 2785). There is no paywall, account tier, or feature lock described — the donation ask is explicitly framed as keeping the site free, not as unlocking content.

Who it is for

• Useful if you already know 3-style commutators and want volume-based drilling with stats, custom lettering, and a slow-case filter.
• Less useful if you are still learning what a commutator is — the trainer assumes you can execute the case, not that it teaches the method.
• Worth trying if you use floating buffers or solve big cubes blindfolded, since the floating and center sets are unusual to find in one free tool.

The practical test: pick your main case set, run a session, and check whether the streak and slow-case data change how you practice. If they do, the tool is doing its job.

Blindtrainer is a free web trainer for Rubik's Cube blindfolded solving, focused on drilling commutators and algorithms in 3-style. To use it, pick a training category (such as Corners, Wings, or XCenters), work through the cases it presents, and use the built-in stats, streak counter, and customization options to track and steer your progress. It suits solvers who already know a blindfolded method and want repetition on specific case types rather than a full solve simulator.

What Blindtrainer Is Built For

The site describes itself as a trainer for commutators and algorithms for blindfolded solving, with practice for "3-style for corners, edges and more." That means it is a drill tool, not a timer or a scramble generator for full solves. You use it to repeat individual cases until the recognition and execution become automatic.

The homepage lists these training categories with case counts:

The case counts tell you how much material each category covers. Corners at 378 cases and Wings at 506 cases are large sets, while Floating Flips at 66 cases is a small, focused set you can finish quickly. If you are new to the trainer, starting with a smaller category gives you a faster sense of how the drill loop works before you commit to a large set.

Basic Training Workflow

1. Choose a category. Select the case type you want to drill — for example Corners if you are working on 3-style corner commutators, or Wings if you are training edge wings.
2. Work the case. The trainer presents a case; you solve it using your blindfolded method.
3. Check your result. The trainer gives feedback on whether the case was handled correctly.
4. Repeat. Cases continue until you stop or finish the set.

The exact on-screen controls for submitting an answer are not documented in the available page content, so treat the first few cases as a calibration run: note what input the trainer expects and how it confirms a correct or incorrect result before you try to train at speed.

Tracking Progress: Streak and Stats

Blindtrainer keeps several running numbers on the page:

• Streak — shown as "Streak: X X," a consecutive-correct counter.
• Total cases trained — cumulative count across your sessions.
• Time spent training — total practice time.
• Most cases trained in 1 day — your single-day record.

These four numbers serve different purposes. Streak measures consistency within a session and is the number to watch when you are pushing accuracy. Total cases trained and time spent training measure volume over time. Most cases trained in 1 day is a personal record that can motivate a longer session, but it is a raw volume figure — a high one-day count with a low streak means you drilled a lot while making repeated errors.

A practical way to use them together: set an accuracy goal first (keep the streak alive), then let volume grow as a byproduct. If your streak keeps breaking at the same point in a category, that category needs slower, more deliberate work rather than more repetitions.

Customization Options

The page exposes several settings that change how cases are presented:

• Accent Color — changes the visual accent used in the interface.
• Speffz — the standard lettering scheme for blindfolded solving, used for labeling sticker positions.
• Custom — a toggle alongside Speffz, suggesting you can use a non-standard lettering setup.
• Letter labels — the page lists a full set of three-letter position labels (UBL, UBR, UFR, UFL, LUB, LUF, LDF, LDB, FUL, FUR, FDR, FDL, RUF, RUB, RDB, RFD, BUR, BUL, BDL, BDR, DFL, DFR, DBR, DBL, UB, UR, UF, UL, LU, LF, LD, LB, FU, FR, FD, FL, RU, RB, RD, RF, BU, BL, BD, BR, DF, DR, DB, DL). These correspond to corner and edge sticker positions.

If you use Speffz, leave the scheme as-is so the labels match the letter pairs you already memorize. If you use a different lettering system, the Custom option is where you would align the trainer with your own scheme — mismatched labels are a common source of confusion when starting out, because you end up translating between two letter sets instead of drilling recognition directly.

Data Management: Sync, Import, Export, and ID

Blindtrainer includes tools for moving your progress between devices or sessions:

• Sync Data — keeps your training data synchronized.
• Import and Export — move your data in and out.
• Your ID — a field showing "[id here]," with an Update my ID button.

The ID is the key to your synced data. If you train on more than one device, set the same ID on each so your stats, streak, and case history follow you. Export before a hard reset if you want a backup — the page also has Reset and Hard Reset buttons, and a hard reset is the one to treat carefully since it clears more than a soft reset.

There is also a Slow Cases option, which suggests the trainer can surface cases you handle slowly so you can target them specifically. That is the most direct route from raw volume to actual improvement: instead of drilling the whole category evenly, let the slow cases get extra repetitions.

Maximizing Your Training

• Drill one category per session. Mixing Corners and Wings in the same block splits your attention between two recognition systems.
• Use Slow Cases as your priority queue. Cases you solve slowly are the ones costing you time in a real blindfolded solve.
• Watch the streak, not just the total. A long streak at a moderate pace beats a high case count with frequent errors.
• Export before resetting. The Reset and Hard Reset buttons are destructive; an export is cheap insurance.
• Set your ID before you accumulate stats. If you add it later, earlier sessions may not be tied to your synced profile.

Cost and Support

The site states that donations "ensure the website stays 100% free" and "help cover maintenance costs," with contributions accepted via PayPal or a bank account. No pricing page, subscription tier, or payment platform for paid access appears in the available content, so there is nothing indicating a paid plan — but the absence of pricing signals is not itself a statement about terms, and any future change would come from the site, not from this description.

Where to Start

If you are opening Blindtrainer for the first time: set your lettering scheme (Speffz or Custom), enter your ID if you plan to train across devices, then pick a small category like Floating Flips (66 cases) to learn the drill loop. Once the loop feels natural, move to the category that matches your current weakness — Corners, Wings, or XCenters — and let the streak and Slow Cases features decide what gets repeated.

Blindtrainer organizes its drills by the type of piece and the solving situation you want to rehearse, not by difficulty level. If you are learning 3-style commutators for Rubik's Cube blindfolded solving, the category you pick determines which cases the trainer serves you: corners, edges, wings, centers, flips, twists, parity, or letter-pair words. The right choice depends on which solving method you use (3-style, M2/OP, LTCT, or similar) and which piece set your method assigns to each algorithm.

How the categories are grouped

The site lists its drills in a single menu, but they fall into a few practical families:

The case counts tell you how large the drill pool is. A larger number means more distinct cases to cycle through; a smaller number like Floating Flips (66) means a tighter, more repetitive set.

What each category is for

Corners

Corner commutators. This is the standard 3-style corner set: 378 cases covering every corner cycle you can encounter. Use it once you know basic corner commutators and want speed and recall under pressure.

Floating Edges, Wings, and U Floating Midges

These separate edges by piece type because different cube sizes and methods treat edges differently.

• Floating Edges (440) — general edge commutators, the counterpart to Corners for a 3x3.
• Wings (506) — the edge pieces on 4x4 and larger cubes that behave like a single "wing" per edge. If you solve big cubes blindfolded, this is your edge drill.
• U Floating Midges (440) — midge edges drilled with a U-layer floating buffer approach. Choose this if your method floats the buffer into the U layer rather than keeping a fixed buffer.

Floating Flips and Floating Twists

These are orientation-only cases, not cycles.

• Floating Flips (66) — edges that are in the correct position but flipped.
• Floating Twists (98) — corners that are in the correct position but twisted.

They are small sets because orientation cases are far fewer than permutation cases. Drill these when your cycles are solid but you keep losing time or making errors on flipped/twisted pieces.

Floating Parity and Corner: 78 / Wing: 23

Parity happens when your corner and edge cycles don't match up, leaving a swap you must resolve. Floating Parity trains the general parity situation; Corner: 78 and Wing: 23 are narrower parity drills tied to corner and wing pieces respectively. Use these once you can already complete full solves and want to stop parity from breaking your execution.

XCenters and +Centers

Center commutators for big cubes, split by center type: XCenters (440) for the X-center positions and +Centers (440) for the +-center positions. Pick the one matching the center type your method solves first, or drill both if you solve 5x5 and up.

Parity/Twist Words

Parity/Twist Words (552) drills the letter-pair words you use to memorize parity and twist cases. This is a memory drill, not a turning drill — it trains recall of your word list rather than finger speed.

LTCT

LTCT (252 cases) is a drill set for the LTCT method specifically. If you don't use LTCT, skip it; the case pool won't match your solving approach.

How to choose

1. Match your method first. If you solve 3x3 with 3-style, start with Corners and Floating Edges. If you solve big cubes, add Wings, XCenters, and +Centers. If you use LTCT, use the LTCT set.
2. Match your buffer style. "Floating" categories assume you float the buffer rather than keeping it fixed. If you use a fixed buffer, the floating variants may not match how you actually solve.
3. Add orientation and parity last. Flips, twists, and parity are smaller sets and easier to absorb once your main cycles are reliable.
4. Use the case count as a workload signal. A 66-case set is a short, repeatable session; a 506-case set is a long-term project. Start with the smaller sets in a family if you want quick wins.

Practical notes

The trainer tracks a Streak, Total cases trained, Time spent training, and Most cases trained in 1 day, so you can measure progress per category. It also offers Sync Data, Import, and Export plus an ID field, which lets you carry stats between sessions or devices. Accent color and a Speffz lettering scheme are configurable, so the letters shown match your own memo system. There is also a Slow Cases view and a Hard Reset option for clearing data.

The site states it is kept 100% free and supported by donations, so no category is gated behind payment.

Yes. Blindtrainer is described on its own site as staying 100% free, and the page states that donations are what keep it that way. Donations are presented as covering maintenance costs, keeping the site free, and making regular updates possible. There is no pricing page, subscription link, or payment platform listed on the site — support is handled through voluntary donations, not paid tiers.

What the site says about being free

The donation section on Blindtrainer states directly that your support:

• helps cover maintenance costs
• ensures the website stays 100% free
• makes regular updates possible

That is the whole of the stated funding model. Nothing on the page suggests a paid plan, a trial limit, or a locked feature set. The training categories — corners, edges, wings, centers, parity, twists, flips and the rest — are listed as part of the same free tool.

How to donate

The page gives two routes, both listed under "Donate":

Note the wording: the PayPal address is explicitly labeled as belonging to the author's father, not to the site itself. If you want your donation to be traceable or to receive any acknowledgement, that detail matters — you are sending money to a personal account, not to a registered organization.

What your donation does not buy

Nothing on the page ties a donation to extra features, ad removal, priority support, or account perks. Donating is framed purely as support for upkeep and continued development. So if you are deciding whether to give:

• Give if you use the trainer regularly and want it to keep running and updating.
• Skip it if you were expecting a paid tier with additional functionality — there isn't one described here.

Practical notes before you send money

• Currency and fees: the bank account uses an IBAN (AT…), so it is an Austrian account. International transfers may carry fees depending on your bank; the site does not mention who absorbs them.
• Recipient name: the page does not state a full legal name for the bank transfer, only the IBAN. Confirm the account holder with your bank if that matters to you.
• No receipt mentioned: there is no statement about tax receipts or donation confirmations.

The short version

Blindtrainer is free to use, and the site says donations are what keep it free and maintained. You can contribute via PayPal to [email protected] or by bank transfer to AT16 3306 5000 0197 2785. Donations are voluntary and, based on the page, do not unlock anything — they simply support the site's upkeep and updates.