CD Calculator vs Period Tools

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

CD Calculator compared with Period Tools
Detail	CD Calculator	Period Tools
What it does	Free Certificate of Deposit calculator showing maturity value, interest and APY in real time	Free, accurate cycle and period predictor
Stage	Not given	Startup
Founded	Not given	2026
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	Not given	All calculators and guides are free. Period Tools Pro (optional): $4.99/month or $19.99/year.
Key features	Real-time maturity value calculation as you type Compound interest formula A = P(1 + r/n)^(nt) applied automatically Balance chart showing principal and interest over time Nine specialized calculators for different CD scenarios Multi-language support for financial terms All calculations run entirely in browser with no data transmission	Predicts next 6 periods Calculates ovulation day Identifies fertile window Private on-device tracking Cloud sync for Pro subscribers No signup required
What makes it different	Completely private: calculations run in your browser with nothing sent to servers or saved Bank-accurate formulas based on Regulation DD conventions No signup, no account, no usage limits required All formulas and methodology fully disclosed and checkable Live updates as you type with no submit button needed	No data collection or server storage Uses standard medical calculation methods Honest about limitations and accuracy No aggressive marketing tactics
Community votes	0	0
DR (Domain Rating by Ahrefs)	1 no change since last check	15 no change since last check
Trust Flow (Majestic)	17	20
Citation Flow (Majestic)	10	9
Referring domains (Majestic)	27	77

4 details filled in for both companies.

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