Every small development office ends up choosing between a funder research tool, a full grantseeking system, a database you build yourself, and a calendar that watches the dates you already owe.
Most nonprofits under ten employees do not have a grants team. One person writes the proposals, chases the program numbers, files the SF-425, and remembers that the family foundation only accepts invitations in April. So the software question is really a question about which part of that job you want carried for you: finding new funders, storing proposal documents, or making sure no date inside a signed award slips past the office.
GrantClock is built for the third job. It takes the awards you already hold, the applications you plan to submit, and the reports those awards create, and puts them on one portfolio calendar with alerts, report status and funder history behind every line. The pages below are fit comparisons rather than scorecards. Read them for the shape of workflow each option assumes, then pick the one that matches how your grant year actually runs.