Every service here is free:
Google Drive (Free spreadsheets, docs in the cloud)
Google Voice (speech-to-text voicemail, plus in the cloud)
Use Contact Form 7 to send proposals (backlinked on our website, password protected, wordpress required)
WhoReadMe.com (know when someone opened an email)
You can choose a fixed price or a flexible price for a android app development services. The former is great for medium and small businesses that do not have enough in-house expertise. A fixed price model is good for large companies as it offers financial security. It helps you focus on important tasks, while a fixed price model can help you avoid unexpected costs. The latter is the best choice for larger organizations. You will save money by working with a dedicated development team.