Comparison

Keyboard² vs FlashSOS Emergency Flashlight

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Keyboard²

This custom keyboard app allows you to play musical notes and chords directly from your device's keyboard. It supports entering numbers, mathematical symbols, and ABC music notation, with the ability to play sounds and chords.

Highlights
  • Play musical notes and chords
  • Enter numbers and mathematical symbols
  • Supports ABC music notation
  • Play sounds
  • Custom keyboard functionality
Features
Read full description

Keyboard² is a custom keyboard that enables you to play the keyboard on your iPhone & iPad! [Function] - You can enter numbers and mathematical symbols. - You can enter the musical scales of ABC music notation. - You can play sound. - You can play a chord. [Attention] - You have to do the additional procedure of Keyboard² to use it. (Preferences -> General -> Keyboard) - Then, you also have to turn on the "Full Access" for Keyboard². * Please don’t worry - we do not collect your data at all. [Support] - Please do not hesitate to contact us for any defect reports or questions/requests. - We will consider any requests for additional functions.

About

FlashSOS Emergency Flashlight

Features
Read full description

■ One-Tap SOS Strobe Emergency Signal Long-press to fire the international standard SOS pattern (3-short / 3-long / 3-short) with synchronised flash and haptics. Strobe adjustable from 1 Hz to 20 Hz. Auto-throttles on low battery and cools down if the torch overheats — never dies when you need it most. Mis-touch protection (1.0s–3.0s long-press confirmation) prevents pocket fires wasting juice. Dual sync: camera torch + full-screen colour flash doubles your visible distance at night. ■ Morse Code Encoding Engine Type any text (English, Chinese, digits, or symbols) — FlashSOS auto-encodes it into clean on/off light pulses. 5 playback speeds: 0.5× / 1× / 1.5× / 2× / 4×; base unit duration customisable from 50 ms to 1000 ms. Includes a full printable Morse reference table inside the app. Use it for backcountry distress, covert signals, concert fan light shows, or team codes. ■ Custom Rhythm Editor (Upgrade to Pro — Lifetime Unlock) Three creative ways to build your own flash pattern: ① BPM Beat Mode — slide from 30 BPM to 300 BPM, every beat fires with millisecond-accurate sync; ② Preset Rhythm Library — 10 built-in scene patterns: Heartbeat / Breathing Light / Lighthouse Beacon / Red-Blue Police Siren @ 1Hz / Concert Cheer @ 120 BPM / SOS International Distress / Strobe Alert @ 8 Hz / 4-4 Rave Kick @ 128 BPM / Flickering Candle / Railway Hand Signal; ③ Manual Tap Recorder — tap the rhythm you want on-screen, we capture the exact ON/OFF timeline locally on your device. ■ Why Choose FlashSOS • Runs 100% locally on-device. Your typed text, saved phrases, recorded rhythms and history stay inside your iPhone's encrypted sandbox. Nothing uploads to any server, ever — no internet connection required at all. • Zero privacy footprint. No sign-in, no location requests, no IDFA collection, no background tracking. Only asks for camera (torch LED) permission when you actively tap the flash button, and you can revoke it any time in iOS Settings. • 12 native languages: Simplified Chinese, Traditional Chinese, English, French, German, Spanish, Italian, Portuguese, Russian, Japanese, Korean, Arabic. • Transparent privacy policy: full stand-alone page (linked in-app and on App Store) explains exactly what we do and do NOT do with every iOS permission we request. ■ FlashSOS Pro (one-time unlock or monthly plan) Unlocks all three premium features: Morse Code, Custom Beats and Strobe Warning. The SOS emergency tab stays 100% free forever - life-saving functions are never paywalled. Restore Purchases and Family Sharing work on the same Apple ID. Subscription: payment is charged to your Apple ID at confirmation. The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period, and each renewal is charged at the same price within 24 hours before the period ends. Manage it in Settings > Apple Account > Subscriptions. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Keyboard²4 screens
FlashSOS Emergency Flashlight4 screens

Verdict

The call

The clearest difference is in-app purchases: Keyboard² at none against FlashSOS Emergency Flashlight's 1. Keyboard² also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.0). FlashSOS Emergency Flashlight's advantage is update cadence (every 3 weeks vs every 12 months). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. FlashSOS Emergency Flashlight sells 1 one-off in-app purchase. Keyboard² asks for nothing beyond the download.

UpkeepUpdate frequency

Keyboard² ships an update every 12 months, FlashSOS Emergency Flashlight every 3 weeks. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
Keyboard² versus FlashSOS Emergency Flashlight: the parameters behind the verdict, then further details
ParameterKeyboard²FlashSOS Emergency Flashlight
PriceFreeFree
Rating4.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 12 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better17.0
Further details — not scored
Size11 MB2 MB
Age rating4+4+
DeveloperTakuto Nakamura晓强 江

In-app purchases

None

Keyboard²

No in-app purchases

1 purchases

FlashSOS Emergency Flashlight

One-time1
  • FlashSOS Pro (Morse + Beat Forever)$1.99

Questions

Is Keyboard² free?
Keyboard² is free to download, with no in-app purchases.
Is FlashSOS Emergency Flashlight free?
FlashSOS Emergency Flashlight is free to download, with in-app purchases available.
Do Keyboard² or FlashSOS Emergency Flashlight have ads?
Neither Keyboard² nor FlashSOS Emergency Flashlight shows ads.
Which is updated more often, Keyboard² or FlashSOS Emergency Flashlight?
Keyboard² ships an update every 12 months, and FlashSOS Emergency Flashlight every 3 weeks. Most recently, Keyboard² was updated on November 2, 2026 and FlashSOS Emergency Flashlight on October 25, 2026.

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