This is my list of iPhone (most iPad also) apps which I have installed on my iPhone and iPad mobile devices, most are free. I do not endorse any apps but Chemistry World, ChemSpider, and RSC Mobile (iOS 10.3.3 for latter) are notable.
I have recently added NMR Solvent Peaks to aid identification of 'unknown peaks'.
Furthermore, see
http://molmatinf.com/products.html#valence for a range of 'Molecular Materials Informatics' related apps.
I have also added the USA EPA apps: CompTox Mobile
https://itunes.apple.com/gb/app/comptox-mobile/id1179517689?mt=8 and m/z EPA CompTox
https://itunes.apple.com/gb/app/m-z-epa-comptox/id1148436331?mt=8.
Also added is ChemTube3D
https://itunes.apple.com/gb/app/chemtube3d/id1291952162?mt=8.
Update: The very latest iPhone/iPad apps to be added are the well-known Organic Syntheses
https://itunes.apple.com/gb/app/organic-syntheses/id1087152400?mt=8 and Isotope Browser by IAEA
https://itunes.apple.com/gb/app/isotope-browser/id943890538?mt=8
NMR Solvent Peaks
https://itunes.apple.com/gb/app/nmr-solvent-peaks/id1293462223?mt=8
ACS Mobile
http://itunes.apple.com/gb/app/acs-mobile/id355382930?mt=8
C&EN Mobile
http://itunes.apple.com/gb/app/c-en-mobile/id451789640?mt=8
Chemical Safety Data Sheets – ICSC
http://itunes.apple.com/gb/app/chemical-safety-data-sheets/id405208132?mt=8
Chemistry By Design
https://itunes.apple.com/gb/app/chemistry-by-design-target-synthesis-database/id451791347?mt=8
Chemistry World
http://itunes.apple.com/gb/app/chemistry-world/id491655965?mt=8
ChemSpider
http://itunes.apple.com/gb/app/chemspider/id458878661?mt=8
Isotope Browser
https://itunes.apple.com/gb/app/isotope-browser/id943890538?mt=8
Molecules
http://itunes.apple.com/gb/app/molecules/id284943090?mt=8
Organic Chemistry Essentials
http://itunes.apple.com/gb/app/organic-chemistry-essentials/id390821660?mt=8
Reagents – Metamolecular
http://itunes.apple.com/us/app/reagents/id453336174?mt=8
RSC Mobile
http://itunes.apple.com/gb/app/rsc-mobile/id459371444?mt=8
ReactionFlash
http://itunes.apple.com/us/app/reactionflash/id432080813?mt=8
At the first time of compiling this list and posting in 2012, and after later edits and additions, all the links to the apps were still valid. However, since then, some iPhone apps may no longer work (after iOS 12 updates) but will still work using iOS 10. My older iPad 4 still uses iOS 10.3.3 and all the iOS apps work there. If you use a Windows or Mac PC, or Android platform, please check and let me know of any problems with the links, or if any apps are no longer available, also of any appropriate new apps that can be added to the above list. There is still no MyRSC mobile app and so you can save a screen image from the link
http://my.rsc.org/home and using Safari on iOS devices and adding the image to the screen of the iOS device. Thank you.
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