Sam Togwell's injury-time equaliser saw Chesterfield earn a dramatic point against promotion-chasing Bradford despite twice falling behind.
The Spireites began on top, but were behind when Nahki Wells fired home his 22nd goal of the season from 15 yards.
Tendayi Darikwa pulled the hosts level from Marc Richards's cross, but the Bantams were ahead again when Ricky Ravenhill's drive flew into the net.
However Togwell fired home to keep his side's hopes of the play-offs alive.
Chesterfield are now four points behind Bradford, who hold the final play-off berth, with both sides having three games to play.