Comparison

Write a letter vs OneAGI

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

Head to head
About

Write a letter

Create professional letters quickly and easily. Save them as PDFs for emailing, printing, or sharing. Customize your letters with formatting, templates, and fonts to match your style.

Highlights
  • Professional letter creation
  • PDF export
  • Email, print, and share options
  • Customizable templates
  • Text formatting
  • Signature integration
  • Sender address management
Features
Read full description

With this app you can write professional letters in just a few minutes. Your letter is saved as a PDF and can be sent by email, printed, or shared via AirDrop at any time. With your signature if you wish. It's that simple: create a sender, enter the recipient, write the letter, done. Design your letters entirely to your own style. The editor supports text formatting such as Bold, Underline and more, so you can highlight important content precisely. Choose between a classic and modern template or create your own letter template with the template generator. Three built-in fonts as well as all fonts installed on your device are available for display. A4 and US Letter are supported. You can save any number of sender addresses, for example private and business, and simply select the right one when writing. Feedback and suggestions for improvement are always welcome. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

OneAGI

This app offers a unified AI experience, combining local and cloud-based artificial intelligence. It provides tools for productivity, learning, creation, and daily tasks, with options for offline privacy and advanced developer features.

Highlights
  • Local AI (Offline LLMs)
  • Cloud AI (Multiple Models)
  • AI Tools for Productivity
  • AI Tools for Learning
  • AI Tools for Creation
  • AI Control Center (OpenClaw)
  • Developer Tools
Features
Read full description

OneAGI — Your All-in-One AI Smart Center OneAGI is a powerful all-in-one AI platform that seamlessly combines local AI and cloud AI into one intelligent experience. Whether you’re online or offline, OneAGI delivers fast, private, and flexible AI capabilities directly on your device. Now, use the OpenClaw module to control your computer through natural conversation, or tap into your phone's capabilities — like automatically managing browser, and system-level actions — turning AI into a true intelligent control center for all your devices. From daily productivity to professional creation, from private offline models to advanced cloud intelligence — OneAGI adapts to every scenario. ================= CORE CAPABILITIES ================= Local AI (Private & Offline) * Run fully offline local LLMs * No internet required, maximum privacy * Secure on-device processing * Custom AI characters for specialized tasks * Perfect for private chat, notes, and data processing Cloud AI (Online LLMs) * Connect to multiple top AI models via API * Support for OpenRouter, Ollama Connect, and multi-model access * Switch models instantly * Multi-LLM simultaneous response mode * Designed for power users and professionals ============== SMART AI TOOLS ============== Productivity & Work * AI Email Writer * Resume Builder * Cover Letter Generator * Meeting Summary * Work Summary * Business Plan * Project Proposal * Research Assistant * Tech Documentation * User Guide Generator Learning & Study * Study Assistant * Learning Plan * Lesson Plan * Research Outline * Research Questions * PDF Chat * AI Notes (Speech-to-Text) Creation & Media * AI Image Generation * AI Video Generation * AI Writing Tools * Story Writer * Script Writer * Lyrics Writer * Blog Post Generator * Ad Copy Creator * Slogan Generator Life & Daily Use * Translation * AI Browser * Food Calorie Recognition * Plant & Bird Identification * Marine Life Recognition * Fitness Plan * Meal Suggestions * Travel Itinerary * Gift Ideas * Movie & Book Recommendations ============================== ADVANCED & DEVELOPER TOOLS ========================== * Local LLM Management * API Keys Center * Dev Mode * MCP Tools * Ollama Connect * Multi-Model Routing * AI Automation Support ============================== WHY ONEAGI ========== * Local + Cloud AI in one app * Offline privacy protection * Lightning-fast performance * Multi-model intelligence * Modular AI tools * Optimized for all devices * Built for both users and developers ============================== ONE PLATFORM. UNLIMITED INTELLIGENCE. ============================== OneAGI is not just an AI app — it’s a complete AI operating platform. From personal life to professional work, from private offline AI to global cloud intelligence, OneAGI gives you one unified AI experience. Smarter. Faster. Safer. More Powerful.

Screenshots

Write a letter4 screens
OneAGI4 screens

Verdict

The call

The clearest difference is price: Write a letter at Free against OneAGI's $19.99. OneAGI's advantage is review sentiment (70% vs 27%) and rating (4.7 vs 4.0). On ratings volume, 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

Write a letter is free to download; OneAGI costs $19.99 up front. Write a letter sells 3 in-app purchases, starting at $2.99 per month. OneAGI asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OneAGI holds the better App Store score, 4.7 against 4.0. Both are backed by a comparable volume of ratings — 29 and 21 respectively. Written reviews point the same way: 27% of Write a letter's written reviews are positive against 70% of OneAGI's.

UpkeepUpdate frequency

Write a letter ships an update every 3 months, OneAGI every 2 weeks. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

Scorecard7 real differences · 3 level
Write a letter versus OneAGI: the parameters behind the verdict, then further details
ParameterWrite a letterOneAGI
PriceFree — better$19.99
Rating4.0 (29 ratings)4.7 (21 ratings) — better
Positive reviews27.4% of reviews70.0% of reviews — better
Number of ratings29 — better21
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.016.4 — better
Further details — not scored
Size40 MB177 MB
Age rating4+17+
DeveloperJan-Hendrik DamerauESOTECH Ltd

Customer experience

Write a letter

All ratings28 ratings
Positive75.0%
Neutral7.1%
Negative17.9%
Written reviews73 reviews
Positive27.4%
Neutral13.7%
Negative58.9%

OneAGI

All ratings21 ratings
Positive90.5%
Neutral9.5%
Negative0.0%
Written reviews20 reviews
Positive70.0%
Neutral15.0%
Negative15.0%

In-app purchases

3 purchases

Write a letter

Subscriptions2
  • Monthly Premium$2.991 Month
  • Annual Premium$22.991 Year
One-time1
  • Lifetime Premium$39.99
None

OneAGI

No in-app purchases

Questions

Is Write a letter free?
Write a letter is free to download, with in-app purchases available.
Is OneAGI free?
OneAGI costs $19.99, with no in-app purchases.
Which has better reviews, Write a letter or OneAGI?
OneAGI is rated higher. Write a letter averages 4.0 out of 5 from 29 ratings, while OneAGI averages 4.7 from 21 ratings.
Do Write a letter or OneAGI have ads?
Neither Write a letter nor OneAGI shows ads.
Which is updated more often, Write a letter or OneAGI?
Write a letter ships an update every 3 months, and OneAGI every 2 weeks. Most recently, Write a letter was updated on October 26, 2026 and OneAGI on October 28, 2026.

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