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Free Curve fitting in Excel, R and Python. No credit card required. API key to use the Assayfit Pro service allowing 50 curve fits. You can renew the key after expiration. The key is valid for two weeks.
500 standards and 500 unknown values can be used with each curve fit.

£0.00
Multi-user key for Curve fitting in Excel, R and Python. API key to use the Assayfit Pro service allowing unlimited curve fits to be used for multiple users within one company on multiple computers and platforms.
1000 standards and 1000 unknown values can be used with each curve fit.
From £40.76
Single-user key for Curve fitting in Excel, R and Python. API key to use the Assayfit Pro service allowing unlimited curve fits to be used for a single user on multiple computers and platforms.
1000 standards and 1000 unknown values can be used with each fit.
From £7.49