Using line icons is a great option if you’re trying to achieve a simple, minimalist aesthetic.

To show what line icons are, here are two iPhone apps that use them:

Line icons in iTunes Store and Phone app.

As you can see from the apps above, line icons are good at reinforcing visual cues of key information without being obtrusive.

If you’re looking for line icons, check out the 40 free icon sets below.

1. Line Icons

2. Streamline Icons

3. Line Icon Set for UI

Line Icon Set for UI

4. Hicons

Hicons

5. Simple Line Icons PSD

Simple Line Icons PSD

6. Thin Rounded Icons

Thin Rounded Icons

7. Thinicons Free PSD

Thinicons Free PSD

8. Other Icons

Other Icons

9. 25 Line Icons

25 Line Icons

10. Linecons Free

Linecons Free

11. Free iOS 7 Icons

Free iOS 7 Icons

12. iOS 7-Inspired Line Icons

iOS 7-Inspired Line Icons

13. Icon Set (144)

Icon Set (144)

14. Free Line-Style Icons

Free Line-Style Icons

15. Settings Line Icons

Settings Line Icons

16. Vectory Mini

Vectory Mini

17. Chapps Vector Icons

Chapps Vector Icons

18. 45 Blue Drops

45 Blue Drops

19. Budicon Tester

Budicon Tester

20. Ecommerce Line Icons

Ecommerce Line Icons

21. E-commerce Icons

E-commerce Icons

22. Eco Ico

Eco Ico

23. Thin Stroke Icons

Thin Stroke Icons

24. Tab Bar Icons iOS 7

Tab Bar Icons iOS 7

25. Free Skinny Icons

Free Skinny Icons

26. Dripicons

Dripicons

27. Nasty Icons

Nasty Icons

28. Tab Bar Icons iOS 7 Vol. 2

Tab Bar Icons iOS 7 Vol. 2

29. Tab Bar Icons iOS 7 Vol. 3

Tab Bar Icons iOS 7 Vol. 3

30. Tab Bar Icons iOS 7 Vol. 4

Tab Bar Icons iOS 7 Vol. 4

31. Simple Line Icons Set

Simple Line Icons Set

32. Simple Line Icons Set Vol. 2

Simple Line Icons Set Vol. 2

33. Simple Line Icons Set Vol. 3

Simple Line Icons Set Vol. 3

34. Simple Line Icons Set Vol. 4

Simple Line Icons Set Vol. 4

35. Cicons: 40 Outline Icons

Cicons: 40 Outline Icons

36. 20 Thin Line Icons

20 Thin Line Icons

37. Simplicons

Simplicons

38. Simple Icons

Simple Icons

39. Free Line Icons for Web and UI Designs

Free Line Icons for Web and UI Designs

40. Line Icons

Line Icons

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Author:

Jacob Gube is the co-founder and a managing editor of Design Instruct. He's a web developer, and also the owner of Six Revisions. Follow Jacob on Twitter: @sixrevisions