Comparison

OSGKeyboard vs Letterform

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

Head to head
About

OSGKeyboard

This intelligent keyboard enhances input efficiency with AI-powered voice dictation. It automatically saves your typing history and allows for customization of frequently used words and phrases. Designed for speed and ease, it supports multilingual typing and helps you focus on your tasks.

Highlights
  • AI voice dictation
  • Automatic input history saving
  • Personal dictionary for frequent words
  • Multilingual typing support
  • Clean and intuitive interface
  • Cross-device compatibility (iPhone, iPad, Mac)
Features
Read full description

OSGKeyboard is your AI mouthpiece — it replies for you, in just the right words. Not sure how to respond? Don't feel like wording it carefully? Hand the message to OSGKeyboard and it crafts a fitting, well-put reply for you — whether you're navigating a tricky conversation, answering chats, or handling everyday small talk you'd rather not think about. One tap gets you the right tone and the right words. From sharp comebacks to gentle diplomacy, from formal emails to casual banter, OSGKeyboard switches between voices and speaks on your behalf — replying, smoothing things over, and saving you the time you'd spend second-guessing every line. Available on iPhone, iPad, and Mac. Open the keyboard, let AI do the talking, and save your energy for what truly matters.

About

Letterform

Features
Read full description

Letterform is a minimalist, local-first Markdown editor built for writers, developers, students, and thinkers who value absolute clarity and digital privacy. When the interface melts away, what remains is the pure connection between your thoughts and the screen. Letterform combines a powerful plaintext editor with a beautiful real-time previewer, allowing you to draft, structure, and refine your ideas without a single distraction. ELEGANT MARKDOWN EDITOR • Format seamlessly as you type with structured headers, text emphasis, blockquotes, and clean lists. • Access swift markdown shortcuts right from your custom keyboard toolbar. • Beautifully formatted typography makes both writing and editing an absolute pleasure. EFFORTLESS LOCAL DEEP ORGANIZATION • Keep your workspace perfectly structured using a clean, uncluttered folder architecture. • Track your metrics at a glance with built-in character counters. • Total Privacy: Your documents stay completely local on your device. Your words are entirely yours. BEYOND PLAIN TEXT • Embed rich media and image attachments natively into your workspace. • Preview rendered markdown output instantly with a single tap. • Manage, rename, and organize assets alongside your writing. Strip away the visual noise. Reclaim your focus. Experience the art of intentional writing with Letterform.

Screenshots

OSGKeyboard3 screens
Letterform4 screens

Verdict

The call

The clearest difference is in-app purchases: Letterform at none against OSGKeyboard's 4. Letterform also leads on iOS requirement (16.4 vs 26.0). On price, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OSGKeyboard sells 4 one-off in-app purchases. Letterform asks for nothing beyond the download.

Scorecard2 real differences · 8 level
OSGKeyboard versus Letterform: the parameters behind the verdict, then further details
ParameterOSGKeyboardLetterform
PriceFreeFree
Rating3.0 (2 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings2 — better—
Update frequencyFortnightly—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.016.4 — better
Further details — not scored
Size35 MB47 MB
Age rating4+4+
DeveloperExtreme PocketGood Code Club

In-app purchases

4 purchases

OSGKeyboard

One-time4
  • 500 points$0.99
  • 1500 points$2.99
  • 3000 points$3.99
Show 1 more
  • Buy me a cup of coffee$3.99
None

Letterform

No in-app purchases

Questions

Is OSGKeyboard free?
OSGKeyboard is free to download, with in-app purchases available.
Is Letterform free?
Letterform is free to download, with no in-app purchases.
Do OSGKeyboard or Letterform have ads?
Neither OSGKeyboard nor Letterform shows ads.

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