---
title: "Subject Line - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "SubjectLine.com, the #1 ranked free email subject line grading tool, has exceeded 10 million subject lines tested. The free online marketing support tool includes over 900 unique rules that are applie"
---

# Subject Line — United States

![Subject Line App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/0d/89/36/0d89365a-2561-4658-cc41-0ae4289db710/AppIcon-0-0-1x_U007emarketing-0-0-0-5-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/434x0w.png)

**Developer:** [Worldata InfoCenter](https://apptail.io/developer/worldata-infocenter-KTAf)
**Category:** Business
**Rating:** 4.7/5 (6 ratings)
**Price:** Free
**Bundle ID:** com.SubjectLine.subjectline
**Store:** Apple App Store
**Country:** United States
**Version:** 3.9.1 (released 2021-01-25)
**Original Release:** 2012-05-29
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id529276278)
**AppTail Page:** [https://apptail.io/app/subject-line-imPc/united-states](https://apptail.io/app/subject-line-imPc/united-states)

## Subject Line Description
SubjectLine.com, the #1 ranked free email subject line grading tool, has exceeded 10 million subject lines tested. The free online marketing support tool includes over 900 unique rules that are applied throughout the subject line testing process. Marketers have the ability, for free, to test any subject line for possible deliverability and marketability issues that could impact overall campaign results.

## Subject Line Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/c6/2f/a1/c62fa108-fe18-357b-ef27-f8a8cf85bd1d/pr_source.png/640x960.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/71/bb/91/71bb9195-f2d0-d12e-9384-aa5089ca0c9e/pr_source.png/640x960.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/8d/06/0f/8d060fc5-c0db-0d48-ea06-5a5f99cf4ec4/pr_source.png/640x960.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/12/2c/e3/122ce38a-f8ed-8ea2-e7a6-0e63d74390c8/pr_source.png/640x960.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/a8/c1/43/a8c143dd-2839-0f56-979c-faf555317eaf/pr_source.png/640x960.png)

## Subject Line Rating Breakdown in United States
- 5 stars: 5 (83%)
- 4 stars: 0 (0%)
- 3 stars: 1 (17%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)






## Subject Line Available In
- [United States](https://apptail.io/app/subject-line-imPc/united-states)
- [France](https://apptail.io/app/subject-line-imPc/france)
- [Nigeria](https://apptail.io/app/subject-line-imPc/nigeria)
- [Canada](https://apptail.io/app/subject-line-imPc/canada)
- [Brazil](https://apptail.io/app/subject-line-imPc/brazil)
- [Switzerland](https://apptail.io/app/subject-line-imPc/switzerland)
- [Chile](https://apptail.io/app/subject-line-imPc/chile)
- [China](https://apptail.io/app/subject-line-imPc/china)
- [Colombia](https://apptail.io/app/subject-line-imPc/colombia)
- [Denmark](https://apptail.io/app/subject-line-imPc/denmark)
- [Algeria](https://apptail.io/app/subject-line-imPc/algeria)
- [Ecuador](https://apptail.io/app/subject-line-imPc/ecuador)
- [Egypt](https://apptail.io/app/subject-line-imPc/egypt)
- [Greece](https://apptail.io/app/subject-line-imPc/greece)
- [Hong Kong SAR China](https://apptail.io/app/subject-line-imPc/hong-kong)
- [Ireland](https://apptail.io/app/subject-line-imPc/ireland)
- [Israel](https://apptail.io/app/subject-line-imPc/israel)
- [India](https://apptail.io/app/subject-line-imPc/india)
- [Italy](https://apptail.io/app/subject-line-imPc/italy)
- [Japan](https://apptail.io/app/subject-line-imPc/japan)
- [Kuwait](https://apptail.io/app/subject-line-imPc/kuwait)
- [Lebanon](https://apptail.io/app/subject-line-imPc/lebanon)
- [Mexico](https://apptail.io/app/subject-line-imPc/mexico)
- [Netherlands](https://apptail.io/app/subject-line-imPc/netherlands)
- [Norway](https://apptail.io/app/subject-line-imPc/norway)
- [New Zealand](https://apptail.io/app/subject-line-imPc/new-zealand)
- [Philippines](https://apptail.io/app/subject-line-imPc/philippines)
- [Pakistan](https://apptail.io/app/subject-line-imPc/pakistan)
- [Saudi Arabia](https://apptail.io/app/subject-line-imPc/saudi-arabia)
- [Sweden](https://apptail.io/app/subject-line-imPc/sweden)
- [Singapore](https://apptail.io/app/subject-line-imPc/singapore)
- [Thailand](https://apptail.io/app/subject-line-imPc/thailand)
- [Taiwan](https://apptail.io/app/subject-line-imPc/taiwan)
- [Ukraine](https://apptail.io/app/subject-line-imPc/ukraine)
- [Vietnam](https://apptail.io/app/subject-line-imPc/vietnam)
- [United Arab Emirates](https://apptail.io/app/subject-line-imPc/united-arab-emirates)
- [South Africa](https://apptail.io/app/subject-line-imPc/south-africa)
- [Argentina](https://apptail.io/app/subject-line-imPc/argentina)
- [Australia](https://apptail.io/app/subject-line-imPc/australia)
- [Belgium](https://apptail.io/app/subject-line-imPc/belgium)

---

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*Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*