Brain Break Mobile

High-fidelity preview of the upcoming iOS & Android app · 34 screens · dark theme · stack navigation

1 · Welcome Screen (first launch)

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🧠🔨

Brain Break

Train your brain,
one question at a time

v1.0.0

🔧 Set up AI provider

⏭️ Skip — set up later in Settings

2 · Provider catalog (Settings → AI Provider)

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Select your preferred AI provider to get started.

OpenAI ✓ Connected

GPT-5.4, GPT-5.4 Mini, GPT-5.4 Nano

Anthropic

Claude Opus 4.6, Sonnet 4.6, Haiku 4.5

›

Google Gemini

Gemini 2.5 Pro, Flash, Flash-Lite

›

Ollama

Local models on your network

›

OpenAI Compatible API

Custom endpoint

›

⏭️ Skip — set up later in Settings

3 · Provider setup — key entry

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Select your preferred AI provider to get started.

OpenAI API Key

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Don't have one yet? Get an OpenAI key — takes 2 min ↗

🔒 Stored in device Keychain — never leaves your phone

Testing connection…

4 · Provider setup — validation failed

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OpenAI API Key

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⚠ OpenAI authentication failed: invalid API key (401)

Get an OpenAI key — takes 2 min ↗

What would you like to do?

🔄 Retry

⏭️ Skip — set up later in Settings

5 · Provider setup — connected ✓

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✅

✓ OpenAI: GPT-5.4 Mini

Your API key has been validated and stored securely on your device.

Done

6 · Home — zero state (no domains yet)

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📚

No domains yet.

👨‍💻 Choose a domain — or create your first one below.

Buy me a coffee ↗

7 · Create domain

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New domain name

Spanish irregular verbs|

Anything you'd like to learn — be as broad or specific as you like.

Starting difficulty

💾 Save

8 · Home — populated (2 domains)

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👨‍💻 Choose a domain:

spanish-irregular-verbs

score: 87 · 14 questions

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behavioral-economics

score: 72 · 6 questions

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Buy me a coffee ↗

9 · Home — with Last Session summary

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── Last Session ──────

spanish-irregular-verbs

🏆 Score delta: +5
📝 Questions answered: 3
✅ Correct / Incorrect: 2 / 1
🎯 Accuracy: 67%

👨‍💻 Choose a domain:

spanish-irregular-verbs

score: 127 · 42 questions

›

behavioral-economics

score: 54 · 18 questions

›

➕ Create new domain

10 · Domain Menu

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Domain — spanish-irregular-verbs score: 87 · 14 questions

Choose an action:

11 · Domain Menu — provider not configured (Play disabled)

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🔧 Set up AI provider

12 · Domain menu — coach staleness banner

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28 new questions since this report — consider regenerating for fresh insights. 🔄 Regenerate

13 · Quiz — loading state

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score: 87

📝 Quiz — spanish-irregular-verbs

Generating question…

↩️ Back

14 · Quiz — question active

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score: 87

📝 Quiz — spanish-irregular-verbs

Conjugate 'poder' in the preterite, first-person singular.

A)podí

B)pude

C)podía

D)puede

15 · Quiz — correct answer + Explain

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score: 88 ↑

📝 Quiz — spanish-irregular-verbs

Conjugate 'poder' in the preterite, first-person singular.

A)podí

B)✓ pude

C)podía

D)puede

Next action:

💡 Explain answer

💫 Bookmark

▶️ Next question

↩️ Back

Explanation

"Poder" is one of a handful of Spanish verbs with an irregular preterite stem. Its stem changes to "pud-", giving "pude" (yo), "pudiste" (tú), etc. — a pattern shared with "saber" (supe) and "tener" (tuve).

16 · Quiz — incorrect answer + Explain

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score: 86 ↓

📝 Quiz — spanish-irregular-verbs

Conjugate 'poder' in the preterite, first-person singular.

A)✗ podí

B)✓ pude (correct)

C)podía

D)puede

Next action:

💡 Explain answer

💫 Bookmark

▶️ Next question

↩️ Back

Why "pude"?

"Podí" follows the regular -er pattern, but "poder" is irregular in the preterite — its stem becomes "pud-". The full form is "pude".

17 · Quiz — Teach me more (inline)

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score: 88 ↑

📝 Quiz — spanish-irregular-verbs

Conjugate 'poder' in the preterite, first-person singular.

B)✓ pude

📚 Teach me more

Spanish has roughly a dozen verbs with irregular preterite stems. Here are the most common patterns:

• u-stem: poder→pud-, poner→pus-, saber→sup-, tener→tuv-
• i-stem: hacer→hic-, querer→quis-, venir→vin-
• j-stem: decir→dij-, traer→traj-, conducir→conduj-

All share the same endings: -e, -iste, -o, -imos, -isteis, -ieron (j-stem verbs drop the i in -ieron → -eron).

Next action:

💫 Bookmark

▶️ Next question

↩️ Back

18 · History — empty (first session)

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📜

No questions answered yet.

Once you start playing, every question you answer shows up here.

▶ Play

19 · History (domain-scoped)

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Question 14 of 14 · Today

Conjugate 'poder' in the preterite, first-person singular.

✅ Correct · ⭐ bookmarked

›

Which verb means "to know (a fact)"?

❌ Incorrect

›

Yesterday

What is the preterite stem of 'venir'?

✅ Correct

›

20 · Bookmarks — empty

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⭐

No bookmarked questions.

Tap 💫 Bookmark after answering to save a question here.

21 · Bookmarks (domain-scoped)

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Bookmark 1 of 2

Conjugate 'poder' in the preterite, first-person singular.

⭐ Saved · 2 days ago

›

Why is 'pude' irregular while 'comí' is regular?

⭐ Saved · 5 days ago

›

22 · Question Detail (from History/Bookmarks)

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Apr 23 · 14:22

Conjugate 'poder' in the preterite, first-person singular.

A)podí

B)✓ pude

C)podía

D)puede

Your answer: B · Correct answer: B
Score: +5 · Speed: fast · Time: 4.2s

Explanation

"Poder" has an irregular preterite stem "pud-", giving "pude".

💡 Explain answer

📚 Teach me more

⭐ Remove bookmark

⬅️ Previous

➡️ Next

23 · Stats (domain-scoped)

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🏆 Score:127

📝 Questions answered:42

✅ Correct / Incorrect:35 / 7

🎯 Accuracy:83%

⏱️ Total time played:38 min

📈 Starting difficulty:3 — Intermediate

📈 Current difficulty:4 — Advanced

🔄 Score trend (30 days):Growing 📈

📅 Days since first session:14

🔥 Return streak:7 days

24 · Stats & My Coach — empty (no data yet)

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🏋️

No data yet

Answer at least one question before using My Coach.

Tip: Reports become more accurate with at least 25 answered questions.

🔄 Regenerate

25 · My Coach (domain-scoped)

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Generated Apr 22 at 09:14

Coaching report

You've made strong progress on preterite conjugations — your accuracy on 'tener', 'venir', and 'poder' has climbed from 60% to 87% in the last two weeks. The pattern that still trips you up is the e→i stem change in verbs like 'pedir' and 'servir'. Try 5 questions specifically on -ir stem-changing verbs this week to lock that in.

Tip: Reports become more accurate with at least 25 answered questions.

🔄 Regenerate

26 · Archive — confirmation action sheet

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Archive "spanish-irregular-verbs"?

You can unarchive it later from ⚙️ Settings → 🗄 Archived domains.

🗄 Archive

↩️ Cancel

27 · Delete domain — native confirmation

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Delete "spanish-irregular-verbs" permanently?

This cannot be undone.

Cancel

Delete

28 · Archived domains

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Choose a domain:

old-marketing-terms

score: 42 · 18 questions · → Unarchive

›

italian-basics

score: 28 · 9 questions · → Unarchive

›

29 · Settings

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💾 Save

30 · Settings picker — Tone of Voice

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Same picker pattern: Language, My Coach Scope, ASCII Milestone, Theme

31 · About — differences from the CLI version

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Brain Break Mobile is built to match Brain Break Terminal feature-for-feature. The differences below are explicit and intentional.

Forced platform divergences

Phase 1 deferrals

View full divergence list on GitHub ↗

32 · Offline-blocked (Play attempted offline)

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Score 87

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You're offline

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Reconnect and try again — your place is saved.

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33 · Provider-gated (Play without provider)

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AI provider not configured

Set up an AI provider in ⚙️ Settings to play, explain, or generate a coaching report.

🔧 Set up AI provider

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34 · Fatal error fallback (error boundary)

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⚠️

Something went wrong

Brain Break hit an unexpected error. Your data is safe.

No information about this error was sent — Brain Break doesn't have a crash reporter installed.

Restart

Send feedback on GitHub

🧠🔨 Brain Break Mobile — Mockups