225+ iOS apps curated and reviewed
If you already know 451F, this is the deeper bench. 225+ 451f apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of June 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | May 2026 |
| 2 |  | Free | 4.6★ (1.6K) | Yes | Yes | Jul 2026 |
| 3 |  | Free | 5.0★ (4) | No | No | May 2026 |
| 4 |  | Free | 4.7★ (32K) | Yes | Yes | Jul 2026 |
| 5 |  | Free | 4.4★ (7.6K) | No | Yes | Jul 2026 |
| 6 |  | Free | 4.8★ (6.3K) | No | Yes | Jul 2026 |
| 7 |  | Free | 4.7★ (47K) | Yes | No | Jul 2026 |
| 8 |  | Free | 4.9★ (67K) | No | Yes | Jul 2026 |
Easily convert temperatures between Fahrenheit and Celsius. Access current, historical, and forecasted weather data for any city in both units simultaneously.
This utility app offers a straightforward way to convert between multiple temperature units simultaneously. It features a dedicated numeric keyboard with support for negative numbers and decimals, ensuring quick and accurate conversions for various scientific and travel needs.
Easily convert documents to and from PDF format in just three steps. Create PDFs from images, share converted files, and manage your conversion history. Supports a wide range of input and output file types.
This app transforms your device into a mobile office for managing PDF documents. Edit, eSign, and fill out forms, then share or export them. It offers secure storage and access to millions of templates, with offline capabilities.
Easily convert temperatures between Celsius, Fahrenheit, and Kelvin with a clean and intuitive interface. This utility app offers quick and accurate conversions for everyday use. Ads are present but can be removed via a one-time purchase.
Quickly convert between thousands of units with an intelligent search and autocomplete feature. This app offers a streamlined interface, an integrated calculator, and the ability to save favorite conversions. It supports over 6,400 units across 51 categories, making it a comprehensive tool for all your conversion needs.
Easily convert your photos and images into PDF documents in just three simple steps. This app offers a user-friendly interface, versatile editing options, and secure, on-device processing. Manage, sign, and share your PDFs effortlessly.
Effortlessly convert temperatures between various scales. Select your starting unit, input the temperature, and get instant results. Supports common and scientific units for comprehensive conversion needs.
This app provides an instant mobile refrigerant charge calculator for HVACR applications. It supports various refrigerants and allows users to calculate the correct system charge based on superheat, subcooling, or airflow, along with environmental conditions.
Edit, convert, and manage PDF documents on your mobile device. This app allows you to directly edit text, scan documents, fill out forms, and secure your files with passwords and watermarks. It also supports OCR to extract text from scans and convert PDFs to various formats.
Edit, read, scan, and convert PDF documents with a comprehensive suite of tools. Annotate, draw, and sign your files with ease. This app offers offline functionality and supports collaboration.
This mobile app offers comprehensive PDF management, allowing users to view, edit, annotate, and convert PDF files on the go. It includes AI-powered features for summarization, translation, and text enhancement, alongside robust tools for creating, signing, and protecting documents.
Edit, create, and secure PDF documents on your mobile device. Scan paper documents to editable PDFs, recognize text with OCR, and fill or sign forms. Convert between PDF and other formats, and protect sensitive files with passwords.
Edit, sign, convert, and organize PDF documents with a comprehensive suite of tools. Scan images to PDF, compress files, and integrate with cloud storage for seamless access across devices. Offers advanced annotation and drawing capabilities.
Estimate and track body temperature trends to monitor potential fever symptoms. Log data, export reports for healthcare providers, and monitor family members' temperatures. Includes features like heart rate estimation and symptom tracking.
Calculate the perceived temperature due to wind speed and actual air temperature. Supports various units for both temperature and wind speed. Includes a tool to convert between different temperature units.
This app calculates thermal comfort by evaluating heat, cold, dryness, and moisture. It provides detailed air property calculations and indicates if conditions are within a comfortable range, with easy dial input and color-coded temperature.
This app offers a comprehensive suite of tools to manage PDF documents. Easily convert, edit, compress, sign, merge, and scan PDFs using your mobile device. It also features OCR technology to convert scanned documents into editable text.
Easily perform fraction calculations including addition, subtraction, multiplication, and division. Convert fractions to decimals and vice versa with a clear, user-friendly interface. Ideal for students, cooks, and DIYers needing quick and accurate fraction management.