Unstable! vs AstroSpell
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Unstable!
Control a bar to defend falling balls from a central core. Collect power-ups to enhance your gameplay and see how long you can survive. Enjoy endless, casual fun with new levels and music.
- Defend falling balls
- Move bar with touch/drag
- Collect power-ups
- Endless gameplay
- New level, new song
- Casual mechanics
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Easy game! Touch or drag your finger on the screen to move the bar and defend the balls coming out of the core. How far can you go? Immortal? Invincible? Wonderful? Final Level? • Simple and casual mechanics. • A new level always a new song. • A new game idea for you to enjoy your time! • Endless gameplay! Free Play! Fast Replay! •Collect the power-ups, Slow, Double Points, Extra Ball and Expand Bar! Have fun. And don't forget! We'd love to hear your opinion! sign: amoraleite
AstroSpell
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AstroSpell is a space-themed word mission game that turns spelling practice into a galaxy journey. Reveal astronomy words, manage oxygen, survive hazards, collect star coins, unlock achievements, and learn real space facts as you progress. The app includes campaign levels, a deterministic daily challenge, Spell-It recall mode, spoken word pronunciation, spaced-repetition review, accessibility-friendly typography, and a Mission Control learning hub. Version 1.3 adds Today's Flight Plan in Mission Control. The app reviews your local progress, missed words, review queue, and accuracy to recommend the best next session: Recovery Run, Spell-It, Campaign, or Daily Challenge. It also shows focus words, estimated practice time, and the category most worth reviewing. Core features include: - 200 astronomy word missions with original hints and facts. - Campaign, Daily Challenge, Spell-It, and Recovery Run modes. - Spoken pronunciation using on-device text-to-speech. - Spaced-repetition word review for missed words. - Mission Control learning hub with the new daily Flight Plan. - Difficulty profiles for different skill levels. - Achievements, star coins, upgrades, and galaxy map progression. - Safe offline play with local stats and progress. - Accessibility options including dyslexia-friendly typography. - Synthesized audio and haptics. AstroSpell does not require an account. Progress, settings, and word mastery stay on the device.
Screenshots
Verdict
The clearest difference is price: Unstable! at Free against AstroSpell's $0.99. Unstable! also leads on iOS requirement (13.0 vs 17.0). AstroSpell's advantage is ads (none vs shown) and update cadence (every 6 days vs every 4 months). On in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Unstable! is free to download; AstroSpell costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Unstable! ships an update every 4 months, AstroSpell every 6 days. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.
| Parameter | Unstable! | AstroSpell |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 3.8 (5 ratings) — better | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 4 months | Every 6 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 153 MB | 7 MB |
| Age rating | +4 | 4+ |
| Developer | Leonardo Amora | Robert Corbin |
In-app purchases
Unstable!
No in-app purchases
AstroSpell
No in-app purchases
