Space Letters vs XenoSignal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Space Letters
Connect with people across the galaxy through unique intergalactic letters. Ask profound questions, share jokes, or send love. Spend hours reading messages from fellow space travelers for a fun and engaging experience.
- Intergalactic letter writing
- Connect with global users
- Read messages from pen pals
- Unique communication experience
- Hours of engaging content
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This app creates a unique experience talking to people across the known galaxy with people which you never would have had any contact in your life otherwise! Write intergalactic letters and ask life's most dire and pressing questions, tell a silly joke or simply send out some love! Instead of writing something entirely new, you can also spend HOURS on end reading what your fellow intergalactic penpals wrote! Its one thing and one thing only: A sh*t ton of fun!
XenoSignal
Explore a comprehensive encyclopedia of extraterrestrial life and knowledge. This sci-fi inspired app offers detailed alien profiles, field notes, and an immersive interface, all accessible offline.
- Detailed alien profiles
- Classified research log format
- Offline access
- Immersive futuristic interface
- Interactive mission control elements
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Explore the Unknown. Decode the Unseen. XenoSignal is your personal gateway to the universe’s most mysterious extraterrestrial life and knowledge. Crafted for curious minds and alien enthusiasts, this sci-fi-inspired encyclopedia blends science, imagination, and style — all in a compact app that works anywhere, anytime. Key Features Alien Profiles – Explore detailed dossiers on alien species, civilizations, and their strange worlds. Field Notes Format – Simple, easy-to-read entries designed like classified research logs. Offline Access – No internet needed after download. Study alien life on the go. Immersive Interface – Sleek design that feels like a futuristic scanner from another world. Interactive Immersion – Battery power simulation, data loaders, and more for that “mission control” vibe. Whether you’re a sci-fi dreamer or a deep-space researcher at heart, XenoSignal turns your device into an interstellar knowledge terminal. Download now and start your journey across the stars.
Screenshots
Verdict
The clearest difference is in-app purchases: Space Letters at none against XenoSignal's 4. Space Letters also leads on update cadence (daily vs every 3 months) and iOS requirement (13.0 vs 18.6). On price, rating, ratings volume and ads 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
Both are free to download. XenoSignal sells 4 one-off in-app purchases. Space Letters asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Space Letters against 5.0 for XenoSignal. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Space Letters ships an update daily, XenoSignal every 3 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.
| Parameter | Space Letters | XenoSignal |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Daily — better | Every 3 months |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 27 MB | 73 MB |
| Age rating | 17+ | 4+ |
| Developer | Paul Brecht | ADAVII (PVT) LTD |
In-app purchases
Space Letters
No in-app purchases
XenoSignal
- Recharge Battery$0.99
- Gain Signal$0.99
- Donate to the Developer$0.99
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- Remove Ads$7.99
Questions
Is Space Letters free?
Is XenoSignal free?
Which has better reviews, Space Letters or XenoSignal?
Do Space Letters or XenoSignal have ads?
Which is updated more often, Space Letters or XenoSignal?
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